From Ligonier Ministries‘ 2009 Conference “Pillars of Truth’, this is wonderfully sound teaching from Pastor Sinclair Ferguson:

“With the rise of Pentecostalism and the charismatic movement in the twentieth century, the Holy Spirit is no longer the forgotten person of the Trinity. There is, however, great confusion among many church members about His person and work and gifts. Sinclair Ferguson explains that it is the responsibility of those called to lead the church to teach those who are entrusted to them about the Holy Spirit—the third Person of the Trinity.”

There are many other free resources at the Ligonier Ministries website which can be accessed here.